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Wiring

Hardware Components

Component Quantity Notes
ESP32-WROOM 1 Main microcontroller with Wi-Fi & Bluetooth onboard
AMS1117 3.3V Regulator 1 Converts 5V (e.g. from USB) to 3.3V for the ESP32 and other modules
ST7735 1.8" TFT LCD 1 SPI-based display module, used as the main UI screen
MSKT-13C01 Switch 1 Optional 3-way slide switch (useful for boot/program/reset selection)
W25Q EEPROM (e.g. W25Q64) 1 Optional external SPI EEPROM for future data storage expansion
Buzzer (active type) 1 Optional — gives audio feedback on events like boot or success
100nF Capacitor 2 For decoupling / noise reduction on power lines
10µF Capacitor 2 Input/output filtering for AMS1117 voltage regulator
Tactile Push Button 3 Used for user input (e.g., mode select, next photo, reset)
USB Type-C Connector 1 Optional — supplies regulated 5V input power to the whole system
2-Pin Header 2 For UART TX/RX connection — useful for debugging via serial monitor

Minimum Requirements

  • Microcontroller: ESP32, you can use other ESP32 variants (like ESP32-S3, ESP32-C3, etc.), but you might need to make some adjustments
  • Power Supply: 5V regulated input via USB or external adapter
  • Display Compatibility: ST7735 must support SPI at 3.3V logic
  • MicroSD or SPI Flash: Must be formatted as FAT32
  • Relay Rating: Make sure relay can handle your heating element’s current (e.g. 5A/250VAC)

Schematic Overview

SCHEMATIC